linux-kernel - [PATCH 0/1] kernel/ucounts: expose current inotify watch count

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Message-Id: <20190121164511.10822-1-albertvaka@gmail.com>
Date:   Mon, 21 Jan 2019 17:45:10 +0100
From:   Albert Vaca Cintora <albertvaka@...il.com>
To:     jack@...e.cz, ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
        nsaenzjulienne@...e.de
Cc:     Albert Vaca Cintora <albertvaka@...il.com>
Subject: [PATCH 0/1] kernel/ucounts: expose current inotify watch count

This patch enables reading the amount of inotify watches in use.

Inotify watches are a finite resource, in a similar way to available file
descriptors. However, there is no way to check how many watches we have
available or in use, we can only read the max.

This patch adds a 'current_inotify_watches' entry to the per-user sysctl table
that gets mounted under /proc/sys/user/. This is the same table that contains
'max_inotify_watches'.

The motivation for this patch is to be able to set up monitoring and alerting
before an application starts failing because it runs out of inotify watches.

Albert Vaca Cintora (1):
  kernel/ucounts: expose current inotify watch count

 kernel/ucount.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

--
2.20.1